
.content{
    width: 90%;
    margin: 0 auto;
}
{
    margin: 10px 30px 20px 50px;
}
#student_info,#select_course,#checkedCourse,#selectedCourse,#modify_password{
    margin: 10px 30px 10px 50px;
 }
.all_info{
    width: 90%;
    margin: 0 auto;
    height: 500px;
    border-top: 1px solid #ccc;
    clear: both;
}
.all_info  .change_info{
    width: 60px;
    color: red;
    float: right;
    margin: 10px 10px 0 0;
    padding-left: 30px;
    background: white url("../images/settings.jpg") no-repeat left center;
    cursor: pointer;
}
.all_info  .change_info:hover{
    text-decoration: underline;
}
a{
    cursor: pointer;
}

